GM/Campaign tools for Linux?

[Snargash Moonclaw]

The hard-drive on my laptop started failing last week so I got a friend to rescue my work files and replace the drive along with the OS (he also dropped in some extra RAM he had lying around from an upgrade on his own system) - flushed Windows with the old drive and now have 3X the storage and memory and running Ubuntu (which uses less of both) with all data/media files restored. Now the fun part is finding apps. Most of what I was using before are open source written for Linux and ported to Windows (Open Office, GIMP, etc.) so no big deal but - does anyone know of any decent mapping, GMing, campaign, etc. tools written for Linux?